摘要
针对厚度为30mm的1060铝合金板材搅拌摩擦焊对焊连接,采用在试板上加工盲孔的方法减少了焊接时大量的飞边.分析了焊缝的组织与力学性能.结果表明:1060铝合金厚板搅拌摩擦焊焊接成形良好.沿厚度方向上的抗拉强度呈先下降后上升的趋势,热影响区与热机影响区之间金属流动性不同,存在明显的结合线,由于该区域组织存在不连续性导致应力集中,拉伸试样的断裂位置主要存在于热影响区与热机影响区的交界处.在焊接接头上部与中部的后退侧的显微硬度高于前进侧,而下部后退侧的显微硬度低于前进侧;焊缝中部的显微硬度随着厚度增大而减小得比较明显,而前进侧与后退侧的减小程度比较小.
Aimed at butt-welding joint of thick plates of 1060 aluminum alloy of 30 mm in thickness with friction stir welding and by means of blind hole drilling on the tested plates,the massive welding burr was decreased by the blind holes and the microstructure and mechanical performance of the weld were analyzed.The result showed that the appearance of the welded joint would be in good shape.The tensile strength along the thickness direction would decrease at first and then increase.There would be an obvious bond line between the thermo-mechanically affected zone and heat-affected zone due to the difference of metal fluidity in there and then the stress concentration would occur due to the discontinuity of the regional organization,so that the fracture position would lie at the interface between thermo-mechanically affected zone and heataffected zone;In upper and middle parts of welded joints,the microhardness on their retreating side would be higher than that on the advancing side.However,in bottom part,the case would be the opposite.It would be obvious that in middle part of welded joint,the microhardness would decrease with the increase of plate thickness but on both the retreating and advancing side it would be relatively small.
出处
《兰州理工大学学报》
CAS
北大核心
2018年第1期21-25,共5页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(10902047)
航空科学基金(201611U2001)
关键词
搅拌摩擦焊
1060铝合金
厚板
抗拉强度
显微硬度
friction stir welding
1060 aluminum alloy
thick plate
tensile strength
microhardness
